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Re: World's Lightest Ramps
4mm thick corrugated 'twinwall' polypropylene sheets can be purchased from Home Depot. One 3' x 6' sheet weighs ~3.5 lb per HD website, and I don't think you'd use more than a third of it to make one ramp.
Ask 469 if you see them -- I think their ramp is made of something similar. It worked well at St. Joe.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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